Line-by-line control of 10-THz-frequency-spacing Raman sidebands

TL;DR

This paper demonstrates precise line-by-line spectral phase control of high-frequency Raman sidebands at 10.6 THz, enabling generation of ultrafast pulse trains at an unprecedented repetition rate.

Contribution

It introduces a novel method combining a spatial phase controller and spectral interferometer for fine spectral-phase control of high-frequency Raman sidebands.

Findings

Achieved flat spectral phase across Raman sidebands.

Generated Fourier transform limited pulses at 10.6 THz.

Demonstrated ultrahigh repetition rate pulse train.

Abstract

We report line-by-line control of a coherent discrete spectrum (Raman sidebands) with a frequency spacing of 10.6 THz that is produced by an adiabatic Raman process. We show that the spectral phase of the Raman sidebands is finely controlled to the target (flat relative-spectral-phase). This is achieved by employing a combination of a spatial phase controller and a spectral interferometer, which are specifically designed for a high-power discrete spectrum. We also show that such spectral-phase control produces a train of Fourier transform limited pulses with an ultrahigh repetition rate of 10.6 THz in the time domain.